钝头前缘加工不确定性对亚声速压气机叶型气动性能的影响

In order to provide a strong reference for the fine design and manufacturing of leading edge of the compressor blades，a high subsonic compressor blade was used as the research object. Based on the non-intrusive polynomial chaos method，the uncertainty impacts of the machining error of blunt leading edge on the blade performance were quantitatively evaluated. Results showed that the blunt leading edge deteriorated the mean performance of the blade in the full range of working conditions. Under incidence of 7°，the fluctuation range of the blade performance was the largest. Under the design incidence，the machining uncertainty of the blunt leading edge caused the increase of mean loss by 18.7% and the decrease of mean pressure ratio by 1.2%. Under incidence of 7°，the fluctuation range of the total pressure loss coefficient of the blade was 4 times that of the design incidence condition. According to the results of sensitivity analysis，it can be found that the aerodynamic parameters and manufacturing error of blunt leading edge showed an approximate linear relationship. Through the uncertainty analysis of the blade flow field，the manufacturing error of blunt leading edge had a significant effect on the flow conditions near leading edge，which led to the increase of suction side loss and wake mixing loss. The influence of the blunt leading edge on the blade under different leading edge machining tolerances was analyzed，and the machining tolerance of the leading edge polishing was determined.